皮皮学，免费搜题
登录
搜题
【多选题】
嘧啶从头合成时,嘧啶环上各原子来源,正确的有( )A.
嘧啶环上的N-1、C-4、C-5和C-6原子都来自天冬氨酸
B.
C-2来自CO2
C.
N-3来自谷氨酰胺
D.
C-2来自甲酸
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】阅读理解。 I was born in Toronto, Canada. Life looked bright and was filled with hope for my parents and me. My father and mother were married in 1980, and I was born next year. As I grew into a man, I oft...
【单选题】a river on land, an ocean Current does not flow in a straight line.
A.
Alike
B.
Like
C.
Likewise
D.
Likely
【判断题】Compared with cash settlement, non-cash settlement is relatively cheaper and more convenient.
A.
正确
B.
错误
【简答题】阅读理解。 Hello, everyone ! My name is Bob. I live in Toronto, Canada. It's a very beautiful city. My parents are from France. They speak French. And I can speak English and French. I am 13 years old and ...
【判断题】Compared with tariff barriers, non-tariff barriers are more concealed, flexible and discriminatory.
A.
正确
B.
错误
相关题目：
参考解析：
知识点：
题目纠错 0
发布
